Insecticide or fungicide and method of making same.



ROBERT V. BROWN, OF CHICAGO, ILLINOIS ASSiGNOR TO THE SHERWIN-WILLIAMSCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

No Drawin g.

To all whom it may concern:

Be it known that I, Roninrr V. Bnowx, a citizen of thel -nited States,and a resident .ofihicago, county of Cook, and State of Illinois,- haveinvented a new and useful Improvement in Insecticides or Fungicides andllethods of Waking Same, of which the following is a specification, theprinciple of the invention being, herein explained and the best mode inwhich I have contemplated applying that principle, so as todistinguishit from other inventions.

The present invention provides a new process for producing a new product'having those properties essential to an insecticide and fungicide.

In the manufacture ofParis green by the i use of arsenious oxid andcopper acetate, there is also a considerable loss of arsenic and copperbecause the reactions which take place in the manufacture, producecertain alkaline materials which tend to prevent the precipitation ofthe arsenic and copper to fonnParis green. The material lost/from thiscause, is of considerable value, and it is very 'diflicult to recover itfrom the re- ='sidual liquor in such form as to render it marketable.

The present invention effects a valuable recovery of the substancesremaining in the residual liquor of the manufacture of Paris green, andthe conversion of the recovered substances into a highly effectiveinsecticide and fungicide.

The residual liquor from the manufacture of Paris green contains arsenicwhich is present as sodium arse'nite Na i i50 and copper which ispresent ascopper arsenite. In carrying out my process, slaked lime C(OH) 2 is added in an amount determined by the amount of arsenic foundby analysis to be present in the residual liquor. Upon agitation, thelime reacts with the sodium arsenite Na AsO, to form sodium hydrateNaOH, and a precipitate of calcium arsenite Ca,,(f\s(),,) and at thesame time the copper arsenite (.ul lAsU, is precipitated from thesolution. The precipitate is immediately filter-pressed to remove thesodium hydrate, and the pressed precipitate is then thoroughly broken upand agitated in watcr.

Acid arscnato of leadPbHAsO is now added to the precipitate in water,and the mass is thoroughly agitated. I have found Specification ofLetters Patent.

Application filed July 13, 1914. Serial No. 850,5?0.

INSECTICIIDE OR FUNGICIDE AND METHOD OF MAKING SAME.

Patented July. 31, 1 917;.

that advantageous results may be obtained by using lead arsenate insubstantially the proportion of 28 pounds to each 100 pounds ofarsenious oxid equiv: lent present in the residual liquor. Coppersulfate CuSOQH O dissolved inavater is now added to the mass, and I havefound that advantageous results may be obtained by using copper sulfatesubstantially. in the proportion of 170 pounds to each 100 pounds ofarsenious oxid AS203 equivalent present in the residual liquor. The massis now thoroughly agi--' tated, and slaked lime is again added toprecipitate copper hydrate Cu(OH) from the copper sulfate which has beenadded,

-The precipitating copper hy'drate forms itself around the particlesbfcalcium arsenite, copper arsenite and lead arsenate in molecularcondition, and after the mass has been agitated until it is of uniformconsistency, the resulting solid is allowed to settle, after which it iswashed and filterpressed.

This resulting solid product may be marketed in paste form by leavingthe desired amount of water in it, or it may be marketed in dry form, bydrying the filterpressed product and then pulverizing it. I have foundthat by using substantially the proportions-stated, in recovering thevaluable constituents from a typical residual liquor from themanufacture of Paris green, the product will be an effective one containing substantially 58 per cent. of calcium arsenite and copper arsenitein the aggregate, 8 per cent. of acid lead arsenate, 14 per cent. ofcopper hydrate, and not to exceed 20 per centfof remaining inertsubintimately mixed therewith, after which copper sulfatein water isadded to the mixture. and the agitation of slaked lime with theresulting mixture will, as before described, precipitate copper hydratein, mo-

lecular condition around the calcium arsenite and the lead arsenate.This product may then be filter-pressed and marketed in either pasteor'dry form, The product'just described, constitutes an eifectiveinsecticide and fungicide, also contain copper arsenite, a smallvquantity of Paris green may be agitated with the mixture before it isfilter-pressed.

Other modes of applying the principle of my invention may be employedinstead of the oneexplained, change being made as regards the processherein disclosed, provided the step or steps stated by any one of thefollowing claims or the equivalent of such stated step or steps beemployed. I therefore particularly point out and distinctly-clam as myinvention In a process to prevent the lo ss of arsenic and copper in themanufacture of aris green, the steps which conlstin precipitatingcalcium arsenite from a solution containing sodium arsenite by theaction of but if it he desired that itv s'emte and lime, mixing leadarsenate with the precipitate, and adding to the mixture copper sulfateand lime.

2. In a process to prevent the loss of arsenic and copper in themanufacture of Paris green, the steps which consist in precipitatingcalcium arsenite and copper arsenite from a solution arsenite and copperarsenite by the action of lime, mixing lead arsenate with theprecipitate, and adding to the mixture copper sulfate and lime.

3. The insecticide or fungicide, comprising the following substancesinsubstantially the proportion stated, 58% of calcium arcopper arsenitein the aggregate, 8% of lead arsenate, 14% of copper hydrate. andincluding not to exceed 20% of inert substances. I

Signed by me, this 8th day of July, 1914.

-' BERT V. BROWN.

containing sodium

